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Creating and Parsing XML Documents in JDeveloper : Page 2

Oracle's XDK 10G extends JAXP to make reading, writing, and querying XML easy.


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Creating an XML Document
In this section you'll see how to create the XML document shown in Listing 1 using the JDeveloper class you just created named CreateXMLDocument.java. Open that class file, and import the DOM and SAX parsing APIs package oracle.xml.parser.v2, and the DOM and SAX parsers package oracle.xml.jaxp:

import oracle.xml.jaxp.*; import oracle.xml.parser.v2.*;

Create a JXDocumentBuilderFactory object with the static newInstance() method:

JXDocumentBuilderFactory factory = (JXDocumentBuilderFactory) JXDocumentBuilderFactory.newInstance();

The JXDocumentBuilderFactory class extends the DocumentBuilderFactory class and adds some static fields to set factory attributes to the class. Table 1 lists the most important attributes. You'll use two of these, the ERROR_STREAM and SHOW_WARNINGS attributes later in the DOM parsing section.

Table 1. JXDocumentBuilderFactory Class Attributes: The table lists several of the most important attributes, along with a short description of each.
Attribute Description
BASE_URL The base URL for parsing entities.
DEBUG_MODE This is a debug—mode switch that you can set to Boolean.TRUE or Boolean.FALSE
ERROR_STREAM The error stream to use for reporting errors. The value is an OutputStream or PrintWriter. If the ErrorHandler event handler is set, ERROR_STREAM is not used.
SCHEMA_LANGUAGE Schema language for validation.
SCHEMA_SOURCE Schema source for validation.
SHOW_WARNINGS Value may be Boolean.TRUE or Boolean.FALSE.

Create a JXDocumentBuilder object using the factory object by calling the newDocumentBuilder() method. Cast the DocumentBuilder object returned by the method to a JXDocumentBuilder type as shown below:



JXDocumentBuilder documentBuilder = (JXDocumentBuilder) factory.newDocumentBuilder();

You obtain a Document object from the JXDocumentBuilder object by calling the newDocument() method. The XMLDocument class implements the Document interface, so you need to cast the returned Document object to an XMLDocument.

The XMLDocument class also implements several other interfaces:

  • DocumentEditVAL
  • ElementEditVAL
  • DocumentEvent
  • DocumentTraversal
  • EventTarget
  • NSResolver
The DocumentEditVAL and ElementEditVAL interfaces add dynamic validation capabilities as specified in the DOM 3 Validation specification. See my DevX article Using DOM 3.0 Validation Techniques with XDK 10g for more information.

The DocumentEvent and EventTarget interfaces add event-handling capabilities, while the NSResolver interface aids in selecting namespace nodes with XPath. The

The XMLDocument class also provides some methods not specified in any of the implemented interfaces. Table 2 shows some of these methods.

Table 2. Additional XMLDocument Methods: The table lists some additional XMLDocument methods along with a description of each.
Method Description
addID(String, XMLElement) Adds an ID Element for the document.
expectedElements(Element) Returns a vector of elements that may be added to the specified element.
getEncoding() Gets the document encoding.
setEncoding(String) Sets the document encoding
getVersion() Gets the XML version.
setVersion() Sets the XML Version.
getIDHashtable() Returns a hashtable of element IDs.
getSchema() Gets the XMLSchema specified in document.
setSchema(XMLSchema) Sets the XMLSchema for the document.
printExternalDTD(
OutputStream, String)
Prints an external DTD to the specified OutputStream using the specified encoding.
setDoctype(String rootname,
String sysid, String pubid)
Sets the Doctype.
setStandalone(String) Sets standalone mode for the XML declaration.
getStandalone() Gets the standalone mode for the XML declaration.



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